1. Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Strasse 2, D-06120 Halle, Germany
2. Department of Chemistry and Pharmacy, Organic Chemistry II, Friedrich-Alexander University Erlangen-Nuernberg, Nikolaus-Fiebiger Str. 10, 91058 Erlangen, Germany
3. South Ural State University, pr. Lenina 76, 454080 Chelyabinsk, Russia